RFC 9898 on Neighbor Discovery Considerations in IPv6 Deployments

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        RFC 9898

        Title:      Neighbor Discovery Considerations in IPv6 Deployments 
        Author:     X. Xiao,
                    E. Vasilenko,
                    E. Metz,
                    G. Mishra,
                    N. Buraglio
        Status:     Informational
        Stream:     IETF
        Date:       November 2025
        Mailbox:    xipengxiao@huawei.com,
                    vasilenko.eduard@huawei.com,
                    eduard.metz@kpn.com,
                    gyan.s.mishra@verizon.com,
                    buraglio@es.net
        Pages:      26
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-v6ops-nd-considerations-14.txt

        URL:        https://www.rfc-editor.org/info/rfc9898

        DOI:        10.17487/RFC9898

The Neighbor Discovery (ND) protocol is a critical component of the
IPv6 architecture. The protocol uses multicast in many messages. It
also assumes a security model where all nodes on a link are trusted.
Such a design might be inefficient in some scenarios (e.g., use of
multicast in wireless networks) or when nodes are not trustworthy
(e.g., public access networks). These security and operational issues
and the associated mitigation solutions are documented in more than
twenty RFCs. There is a need to track these issues and solutions in a
single document.

To that aim, this document summarizes the published ND issues and
then describes how all these issues originate from three causes.
Addressing the issues is made simpler by addressing the causes. This
document also analyzes the mitigation solutions and demonstrates that
isolating hosts into different subnets and links can help to address
the three causes. Guidance is provided for selecting a suitable
isolation method to prevent potential ND issues.

This document is a product of the IPv6 Operations Working Group of the IETF.

INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.

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